The communications port has been set
Parameters passed to GPSNOTIFYPROC:
lParam1
The number of the communications port.
lParam2
A pointer to a NULL-terminated text status message: "Comm port set to port <n>" (where <n> is the communications port number). On Windows CE platforms this will be a Unicode buffer; on all other platforms it is an ASCII buffer.
lParam3
Contains the user-defined parameter lUserParam that was passed to the
GpsSetNotificationCallback function.